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Very high precision bound state spectroscopy near a $^{85}$Rb Feshbach resonance

Authors
  • Claussen, N. R.
  • Kokkelmans, S. J. J. M. F.
  • Thompson, S. T.
  • Donley, E. A.
  • Wieman, C. E.
Type
Preprint
Publication Date
Feb 10, 2003
Submission Date
Feb 10, 2003
Identifiers
DOI: 10.1103/PhysRevA.67.060701
arXiv ID: cond-mat/0302195
Source
arXiv
License
Unknown
External links

Abstract

We precisely measured the binding energy of a molecular state near the Feshbach resonance in a $^{85}$Rb Bose-Einstein condensate (BEC). Rapid magnetic field pulses induced coherent atom-molecule oscillations in the BEC. We measured the oscillation frequency as a function of B-field and fit the data to a coupled-channels model. Our analysis constrained the Feshbach resonance position [155.041(18) G], width [10.71(2) G], and background scattering length [-443(3) a$_0$] and yielded new values for $v_{DS}$, $v_{DT}$, and $C_6$. These results improved our estimate for the stability condition of an attractive BEC. We also found evidence for a mean-field shift to the binding energy.

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